CorePlane OkHttp DNS IPv4 preference

CorePlaneOkHttpClientFactory.java

// Customize OkHttp to add IPv4 DNS preference

import com.facebook.react.modules.network.OkHttpClientProvider;
import com.facebook.react.modules.network.OkHttpClientFactory;
import okhttp3.OkHttpClient;

public class CorePlaneOkHttpClientFactory implements OkHttpClientFactory {
    public OkHttpClient createNewNetworkModuleClient() {
        return OkHttpClientProvider.createClientBuilder()
            .dns(new CorePlaneOkHttpDNSSelector(CorePlaneOkHttpDNSSelector.IPvMode.IPV4_FIRST))
            .build();
    }
}

CorePlaneOkHttpDNSSelector.kt

import okhttp3.Dns
import java.net.Inet4Address
import java.net.Inet6Address
import java.net.InetAddress
import java.util.logging.Logger

class CorePlaneOkHttpDNSSelector(private val mode: IPvMode) : Dns {

  enum class IPvMode(val code: String) {
    SYSTEM("system"),
    IPV6_FIRST("ipv6"),
    IPV4_FIRST("ipv4"),
    IPV6_ONLY("ipv6only"),
    IPV4_ONLY("ipv4only");

    companion object {
        @JvmStatic
        fun fromString(ipMode: String): IPvMode =
        IPvMode.values().find { it.code == ipMode } ?: throw Exception("Unknown value $ipMode")
    }
  }

  override fun lookup(hostname: String): List<InetAddress> {
    var addresses = Dns.SYSTEM.lookup(hostname)

    addresses = when (mode) {
      IPvMode.IPV6_FIRST -> addresses.sortedBy { Inet4Address::class.java.isInstance(it) }
      IPvMode.IPV4_FIRST -> addresses.sortedBy { Inet6Address::class.java.isInstance(it) }
      IPvMode.IPV6_ONLY -> addresses.filter({ Inet6Address::class.java.isInstance(it) })
      IPvMode.IPV4_ONLY -> addresses.filter({ Inet4Address::class.java.isInstance(it) })
      IPvMode.SYSTEM -> addresses
    }

    //logger.fine("DJMOKHTTP ($hostname): " + addresses.joinToString(", ") { it.toString() })

    return addresses
  }

  companion object {
    private val logger = Logger.getLogger(CorePlaneOkHttpDNSSelector::class.java.name)
  }
}

MainApplication.java

public class MainApplication extends Application implements ReactApplication {

  // ...
  
@Override
  public void onCreate() {
    super.onCreate();
    OkHttpClientProvider.setOkHttpClientFactory(new CorePlaneOkHttpClientFactory());
  }

  // ...
}

How can I apply this to an Expo app?
@andreialecu @andac-ozcan @danmaas

when i try to compile with this i get: cannot find symbol OkHttpClientProvider.setOkHttpClientFactory(new CorePlaneOkHttpClientFactory()); ^ symbol: variable OkHttpClientProvider location: class MainApplication what is the solution?

@HodayaGruz I also got this error, did You find how to solve it?

when i try to compile with this i get: cannot find symbol OkHttpClientProvider.setOkHttpClientFactory(new CorePlaneOkHttpClientFactory()); ^ symbol: variable OkHttpClientProvider location: class MainApplication what is the solution?

@HodayaGruz I also got this error, did You find how to solve it?

You should import this:
import com.facebook.react.modules.network.OkHttpClientProvider;